After installing Win 7 on my Acer Aspire 5920 my battery life went from ~2 hours to about 20 minutes. wtf? Now Win 7 recommends that I replace my battery. Seems a bit fishy to me but I typically dont go far from a power outlet when using it so its not usually a big deal.
So your suggesting in that last sentence that Windows 7 has some how physically hurt the battery life even if you installed a different OS? I have a feeling that last sentence is a typo or something.
Yes windows 7 has lowered my battery life by roughly 10% on an Compaq 2510P when coming from XP. I am sure if I put XP back on, that I could get that 10% back, but since I get 7 hours of life its more than enough still.
Ever since I installed Windows 7 on my PCs, I've noticed all my batteries have gotten worse too! The AA batteries in my TV Remote (which are rechargeable) and the AA and AAA batteries in my 2 year old's toys need constant recharging.
Obviously I'm being sarcastic. I'm not thinking the OS itself can have some sort of physical and permanent affect on a laptop battery's ability to hold and keep a charge. That just doesn't make any sense.
It hasn't hurt the battery that I can tell, but I can say my wife's MacBook Pro runs for well over 6 hours, even with the 9600GPU active and WiFi enabled, under OS 10.6. With Win 7 running in a VM, it runs about 5 hours (much heavier RAM and disk IO lolad running 2 OS concurrently, so that's not surprising). However, that VM is actually a boot camp partition, and if I boot into it directly, the machine won't last 3 hours on a full charge. It's not recommending battery replacement, but it runs it down way faster... I can confirm, it;s not just a bad sensor, as once Windows 7 goes down, booting into OS X confirms the battery only has a few minutes left in it.
Win 7 is recommending battery replacement on another older notebook i have, but I can't say that's a problem as it won't run 5 minutes anyway on a charge, that battery's long since passed it's usable life... i use it exclusively while plugged in. i only keep the battery in it as it gives me a cushion on usabiltiy if I have to change seats in the living room (and thus outlets) or if our 2yrold gets a hold of it...
i have a lenovo y550 ideapad, which came with vista when i got it, since i installed Win7 i have actually seen a slight improvement in the battery life prediction from the system, although the actual battery life hasn't changed at all
[citation][nom]jerreece[/nom]... I'm not thinking the OS itself can have some sort of physical and permanent affect on a laptop battery's ability to hold and keep a charge. That just doesn't make any sense.[/citation]
Actually the OS can permanently damage the battery. The problem starts with the hardware and the charging circuit used in the laptop. Lithium batteries are very sensitive and quickly can be damaged if not charged properly. If the charging logic is moved into the driver there is small chance that due to software bug could overcharge the battery and destroy it. For example the OS sends command for quick charge, but battery heats up the driver should detect that and reduce the current. If the battery gets hot its life is reduced significantly. That is why many people recommend to charge your battery only to 60% of its capacity in order to protect the battery. And if you working plugged-in most of the time the best thing to do is to remove the battery. It is much cheaper to get $40 UPS then using notebooks battery as UPS.
Windows 7 actually tripled the life of my battery on my D630 latitude, I think most people are not logical as they forgot to reset their power options (aka balanced in win 7 = power user in vista and = balanced in win XP) (aka power saver = normal in vista = balanced + in win XP)
I too started experiencing extremely short battery life rather suddenly after installing Windows 7. I use my laptop on AC power 90% of the time, and Vista always gave me decent battery life (apx 2 hrs, but that's with a 17" screen and dual internal hdds). After installing Windows 7 I noticed that the battery starts dropping visibly as soon as I unplug the AC power, taking just a couple of minutes to drop to the low 80% level; in addition to this I keep receiving notifications that I should replace my battery. All this happens even though a week before installing 7 the battery was working like new. I just assumed that it decided to die spontaneously, but reading this I'm being to wonder if that's really the case.
4+ hours on energy-saving settings on new gateway rocking core-i5 (hah! supposed to be a core-i3!), 4GB DDR3, 320GB (assuming 5400rpm) HDD, and 15.6 LED-lit display on a 6-cell battery.
ask me, that ain't too shabby. Honestly, though, I think it could be closer to that 5 hour mark. but compared to my old dell's 6 minute (literally), that's not bad at all.
BTW, on my earlier comment, it's a Gateway NV5927u if anyone's looking the 4+ batt life again is power-saver settings while typing docs with occasionally refreshing Tom's Hardware
I think what it might be is some people are "new" to laptops. they've been on XP desktops for so long they forget/don't understand that the more stuff you're running (i.e. torrenting while watching a movie and ripping a CD simultaneously), the lower the battery life will be. My little brother thought that, too. But at the age of 13, he was able to realize that if he 'net access and cd ripping out of the equation, the battery life goes up.
Simply put, want to run it like a desktop, better be plugged in like one.